Direct observation of confined acoustic phonon polarization branches in free-standing semiconductor nanowires

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Kargar, Fariborz
dc.contributor.author Debnath, Bishwajit
dc.contributor.author Kakko, Joona Pekko
dc.contributor.author Säynätjoki, Antti
dc.contributor.author Lipsanen, Harri
dc.contributor.author Nika, Denis L.
dc.contributor.author Lake, Roger K.
dc.contributor.author Balandin, Alexander A.
dc.date.accessioned 2017-05-11T09:15:29Z
dc.date.available 2017-05-11T09:15:29Z
dc.date.issued 2016-11-10
dc.identifier.citation Kargar , F , Debnath , B , Kakko , J P , Säynätjoki , A , Lipsanen , H , Nika , D L , Lake , R K & Balandin , A A 2016 , ' Direct observation of confined acoustic phonon polarization branches in free-standing semiconductor nanowires ' NATURE COMMUNICATIONS , vol 7 , 13400 . DOI: 10.1038/ncomms13400 en
dc.identifier.issn 2041-1723
dc.identifier.other PURE UUID: f49cea56-39e8-4633-90e0-5eaec1ee9299
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/direct-observation-of-confined-acoustic-phonon-polarization-branches-in-freestanding-semiconductor-nanowires(f49cea56-39e8-4633-90e0-5eaec1ee9299).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=84994817343&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/11525094/ncomms13400.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/25972
dc.description.abstract Similar to electron waves, the phonon states in semiconductors can undergo changes induced by external boundaries. However, despite strong scientific and practical importance, conclusive experimental evidence of confined acoustic phonon polarization branches in individual free-standing nanostructures is lacking. Here we report results of Brillouin-Mandelstam light scattering spectroscopy, which reveal multiple (up to ten) confined acoustic phonon polarization branches in GaAs nanowires with a diameter as large as 128 nm, at a length scale that exceeds the grey phonon mean-free path in this material by almost an order-of-magnitude. The dispersion modification and energy scaling with diameter in individual nanowires are in excellent agreement with theory. The phonon confinement effects result in a decrease in the phonon group velocity along the nanowire axis and changes in the phonon density of states. The obtained results can lead to more efficient nanoscale control of acoustic phonons, with benefits for nanoelectronic, thermoelectric and spintronic devices. en
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries NATURE COMMUNICATIONS en
dc.relation.ispartofseries Volume 7 en
dc.rights openAccess en
dc.subject.other Chemistry(all) en
dc.subject.other Biochemistry, Genetics and Molecular Biology(all) en
dc.subject.other Physics and Astronomy(all) en
dc.subject.other 114 Physical sciences en
dc.title Direct observation of confined acoustic phonon polarization branches in free-standing semiconductor nanowires en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department University of California at Riverside
dc.contributor.department Department of Micro and Nanosciences
dc.contributor.department Moldova State University
dc.subject.keyword Chemistry(all)
dc.subject.keyword Biochemistry, Genetics and Molecular Biology(all)
dc.subject.keyword Physics and Astronomy(all)
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201705114347
dc.identifier.doi 10.1038/ncomms13400
dc.type.version publishedVersion


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